Very cool hash builder taken from stack overflow

hash_builder.rb

class HashBuilder

  def self.build &block
    hb = HashBuilder.new
    hb.instance_eval(&block)
    hb.hash
  end

  attr_reader :hash

  def initialize
    @hash = {}
  end

  def method_missing meth, *args, &block
    @hash[meth] = block ? HashBuilder.build(&block) : args.first
  end
end

p HashBuilder.build{
  a :b
  c :d
  e do
    f :g
  end
}
#=> {:a=>:b, :c=>:d, :e=>{:f=>:g}}


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# answered Jul 29 '11 at 13:23

# Mladen Jablanović
# 18.1k23256